Spraying booth and the like



Jan; 13, 1931. J. A. PAASCHE SPRAYING BOOTH AND THE LIKE 2 Sheets-Sheet 1 Filed Dec. 22, 1927 Jan. 13, 1931.

J. A. PAASCHE SPRAYING BOOTH AND THE LIKE 22, 1927 2 Sheets-Sheet 2 Filed Dec.

Patented Jan. 13, 1931 PATENT [OFFICE J ENS A. PAASCHE, OF CHICAGO, ILLINOIS SPRAYING BOOTH AN D THE LIKE Application filed December 22, 1927. Serial No. 241,885.

This invention relates to certain" improve ments in spraying booths and the like such as are used in connection with various spraying operations. The construction of spraying booth herein disclosed is well adapted for use in connection with paint spraying operations in which relatively volatile and noxious fumes are generated.

More particularly, the invention has reference to an improved construction of spraying booth in which there is provided an exhaust fan for removing the fumes and vapors from the interior of the booth and delivering them into a suitable flue or delivery connection.

The features of the present invention have particular reference to the arrangement and construction of this exhaust-fan structure and the housing within which it is accommodated. This application is a division of my co-pending application for Letters Patent of the United States on improvements in spraying booths and the like, Serial No. 135,092, which was filed September 13, 1926.

One of the objects of the invention is to provide, in structures of the foregoing general arrangement, a motor housing wherein the driving motor is accommodated, together with an exhausting fan driven by said motor, the driving shaft between the motor and fan extending across the duct through which the air and gases flow, or-a portion of said duct. The arrangement is such that the motor and its bearings are located at the suction side of the fan so that any leakage of air around the same will result in drawing fresh air inwardly past and around the motor and bearings so that the latter will not be subjected to the harmful influences of the gases and ma terials which are being exhausted.

Another feature of the invention relates to the provision of a housing within which the motor is located, the motor shaft reaching from said housing across the flue or duct to the fan which is driven thereby. Said motor housing is also provided at one point with a screen or an opening through which air isallowed to seep into the housing so that it flows through the housin and past and around the motor into the no. By protecting this aforesaid opening with a suitable screen or air filter, any dust or other impurities lIlJlII'lOllS to the motor will be removed, and thus the operation of the motor will be correspondingly improved.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of con struction and combinations of parts hereinafter described and claimed.

In the drawings:

Fig. 1 shows a plan view of a booth or cabinet embodying the features of the present invention Fig. 2 shows a side ing to Fig. 1;

Fig. 3 shows a fragmentary, vertical section on the line 33 of Fig. 1, looking in the direction ofthe arrows, but on an enlarged scale; and

Fig. 4 shows a fragmentary, horizontal section on the line 4-4 of Fig. 2, looking in the direction of the arrows, but on an enlarged cale.

The spray booth itself is designated in its entirety by the numeral 5. It is open on its front side 6, which-opening is of sufficient size to accommodate tables or other articles which are to be spray-treated.

I will not burden this specification with a detailed explanation of the construction of the booth itself, inasmuch as the same constitutes the subject matter of the aforesaid application Serial N 0. 135,092. I will state, however, that the rear port-ion of the booth is tapered, as shown at 7 in Figs. 1 and 2, and

elevation corresponddraws down towards a throat section which then communicates rearwardly with a flue 8, which is relatively narrow and of some what triangular cross section, as best shown in Figs. 3 and 4. This flue-portion 8 has its side walls suitably reinforced, as by means of angle bars 9. The extreme rear end of this flue portion 8 is rounded on a circular are, as shown at 10, and a delivery flue connection 11 has its end connected to one side of the rounded portion 10 of the throat 8. The delivery of air and gases to the connection 11 is performed through a circular opening 12, as shown in Fig. 3.

Opposite to the position of the flue connection 11 there is located a motor housing 13. The same is of generally conical form, its base being connected to the sheet 14 which constitutes the side of the flue 8. This sheet 14 is provided with a central opening 15 through which extends the elongated bearing 16 of the driving motor 17, preferably an electric motor. The motor shaft 18 reaches from the bearing 16 clear across the flue 8 and into the intake end of the flue 11, as best shown in Fig. 4. The fan 19 is mounted on the end portion of said shaft 18 and works within the intake end of the flue 11. The fan 19 is of such construction and is driven in such a direction that the efi'ect is to create a" suction within the flue 8 and to deliver into the flue connection 11, as indicated by the arrows.

Consequently the flue 8 is always subject to a reduced pressure.

The motor housing 13 has its end portion provided with a relatively large opening 20,

sufficiently large, in fact, to conveniently pass the motor 17 so as to allow the same to be set into place or removed without difficulty. This opening 20 is normally closed by a screen or filter 21, which comprises suitable dust-removing materials such as a screen of relatively fine mesh supporting a fireproofed cloth or fibrous pad through which the air is drawn to the interior of the motor housing. This filter is held in place by a suitable support such as a clamping flange 22 forced down over its edge, as shown in Fig. 4.

In actual construction the hole 15 in the partition 14 is made somewhat larger than the end portion of the motor which reaches through it, so as to allow a slight clearance between the parts. Due to the fact that there exists a suction within the flue 8, this will lower the pressure of the air within the motor housing, tending to cause a circulation of fresh air from the filter 21. through the mooften of a highy for housing and around the motor into the flue 8. Consequently, during the regular operation of the device, the motor itself will always be subjected to a current of fresh, cool air, thusnot only cooling itfliut largely avoiding the deposition of any dust, inflammable or foreign material which might be injurious to the motor, by reason of the filter. Furthermore, it would be impossible for noxious or dangerous or combustible gases or fumes from the spraying booth to findtheir way backwardly or from the outside spray room" into the motor ho sing 13. These fumes are explosive composition. WVhen spraying bZonze or metallic materials these have a tendency to fly aroundan the spray room and when settling on the motor armatures and fields, they cause ashort c1r cuit and often burn out the motor. By reason of the construction herein disclosed the danger of explosion, short circuitlng or fire due to ignition of such fumes by a motor spark will be entirely eliminated.

It will be noted that the shell of the motor 17 is of somewhat conical form. The conical form of the motor housing 13 is therefore well adapted for covering over and protecting this form of motor within a minimum of space and in a very compact manner.

As a matter of convenience in construction, I prefer to attach a flue 23 to the flue connection 11 by means of a flange 24 and bolts 25, so that the flue 23 can be set into place at different angles of attachment. This will make it possible to deliver the fumes either straight up or towards one side or downwardly, or in any other convenient direction.

lVhile I have herein shown and described only a single embodiment of the features of my present invention, still I do not intend to limit myself thereto except as I may do so in the claims.

I claim:

1. In a self-contained ventilating unit, the combination of a fan housing having an inlet connection and a delivery flue connection reaching sidewise from one side of said fan housing and at right angles to said inlet.

in the flue connection and an induced draft" fan on said shaft located in the flue connection and operative effectively to draw'air from the inlet connection and deliver the same into the flue connection, substantially as described.

2. In a self-contained ventilating unit, the

combination of a fan housing having an inlet connection and a delivery flue connection reaching sidewise from one side of said fan housing and at right angles to said inlet connection, a conical motor housing reaching sidewise from the side of said fan housing opposite to the flue connection, there being a partition between the fan housing and the motor housing having a central opening opposite to the delivery flue connection, a motor within the motor housing having a bearing projecting through said partition opening into the fan housing, a motor shaft reaching from said bearing across the fan housing to a osition in the flue connection, an induced raft fan on said shaft located in the flue connection and operative effectively "to'draw air frlom the inlet connection and de- .J ENS A. PAASOHE. 

